What are the best quantum computing stocks to buy?

This page provides technical data, not investment advice. The publicly traded pure-play quantum computing companies as of May 2026 include IonQ (IONQ, trapped-ion), D-Wave Quantum (QBTS, quantum annealing), Rigetti Computing (RGTI, superconducting), Quantum Computing Inc. (QUBT, photonic), Arqit Quantum (ARQQ, quantum encryption), Infleqtion (INFQ, neutral-atom, SPAC-listed Feb 2026), and Xanadu (XNDU, photonic, TSX-listed June 2025). Quantinuum filed a confidential IPO S-1 with the SEC in February 2026 — if it proceeds, it would be the largest pure-play quantum hardware IPO in history. IBM (IBM) and Alphabet/Google (GOOGL) offer quantum exposure within diversified tech portfolios.

Is IonQ a good quantum computing stock?

IonQ (NYSE: IONQ) is the largest pure-play quantum computing stock by market capitalization. It uses trapped-ion technology, which offers high gate fidelity and all-to-all qubit connectivity. IonQ's systems are available on all three major cloud platforms (AWS, Azure, Google Cloud). The company is pre-revenue for quantum computing and is valued primarily on future potential. Trapped-ion systems have inherent advantages in qubit quality but face challenges in scaling to thousands of qubits. This is technical context, not investment advice.

What is the difference between pure-play and diversified quantum stocks?

Pure-play quantum computing stocks (IonQ, Rigetti, D-Wave, QUBT, Arqit, Infleqtion, Xanadu) derive most or all of their revenue and valuation from quantum technology. They offer maximum quantum exposure but carry higher risk because quantum computing is not yet commercially profitable at scale. Quantinuum — currently a Honeywell subsidiary — has filed a confidential S-1 for IPO, which would add another major pure-play option. Diversified quantum stocks (IBM, Google/Alphabet, Microsoft, Amazon, Honeywell) have major quantum computing programs but derive almost all revenue from other businesses. Diversified stocks offer lower quantum-specific exposure but lower risk.

When will quantum computing stocks become profitable?

Most analysts estimate that pure-play quantum computing companies will not achieve sustained profitability until the late 2020s to early 2030s, when quantum advantage for commercial applications becomes practical. Currently, quantum computing revenue comes primarily from cloud access fees, government contracts, and consulting services. The addressable market is projected to grow significantly once fault-tolerant quantum computers can solve problems in drug discovery, materials science, financial modeling, and logistics that classical computers cannot.

How do I evaluate quantum computing stocks?

Key technical metrics to evaluate quantum computing companies include: qubit count and fidelity (higher fidelity matters more than raw count), quantum volume or comparable benchmark scores, error correction progress, cloud platform availability, patent portfolio strength, government contract revenue, partnership ecosystem (pharma, finance, defense), and published quantum advantage demonstrations. Financial metrics include cash runway, revenue growth rate, and path to profitability. The quantum technology approach (superconducting, trapped-ion, photonic, neutral atom, topological) also affects the long-term scalability thesis.

Are quantum computing stocks overvalued?

Quantum computing stocks have historically traded at extremely high valuations relative to current revenue, reflecting speculative bets on future market potential. The quantum computing total addressable market is projected to reach $50-65 billion by 2035, but current revenue across the entire industry is measured in hundreds of millions. Whether current valuations are justified depends on the timeline for quantum advantage, which technology approach proves most scalable, and whether the projected TAM materializes. This page provides market data, not valuation opinions.

QUANTUM.INTEL

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Home/Quantum Computing Stocks

INVESTOR REFERENCE // QUANTUM STOCKS

Quantum Computing Stocks: Complete Guide

Every publicly traded quantum computing company, organized by ticker, exchange, quantum technology approach, and IPO date. This reference covers pure-play quantum stocks (IonQ, D-Wave, Rigetti) and diversified technology companies with major quantum programs (IBM, Alphabet, Microsoft). Data is sourced from SEC filings and exchange records. This page provides technical and market data only and does not constitute investment advice.

Published: March 2026 | Updated: May 2026 | Source: quantumintel.tech

Pure-Play Quantum Stocks

Exchanges

NYSE, NASDAQ

Technology Approaches

Earliest IPO

2021

SECTION 01 // PURE-PLAY QUANTUM STOCKS

Pure-Play Quantum Computing Stocks

These companies derive most or all of their revenue and valuation from quantum computing technology. The first wave went public through SPAC mergers in 2021–2022. Xanadu listed on the TSX (XNDU) in June 2025, and Infleqtion completed its SPAC merger (NASDAQ: INFQ) in February 2026. Quantinuum filed a confidential S-1 with the SEC in February 2026 — IPO pending market conditions.

Ticker	Company	Exchange	Approach	IPO Date	Status
IONQ	IonQ	NYSE	trapped-ion	2021-10-01	trading
QBTS	D-Wave Quantum	NYSE	quantum annealing / gate-model	2022-08-05	trading
RGTI	Rigetti Computing	NASDAQ	superconducting	2022-03-02	trading
QUBT	Quantum Computing Inc.	NASDAQ	photonic	2021-07-01	trading
ARQQ	Arqit Quantum	NASDAQ	quantum encryption	2021-09-07	trading
INFQ	Infleqtion	NASDAQ	neutral-atom	2026-02-15	trading
XNDU	Xanadu	TSX	photonic	2025-06-01	trading
688027.SS	QuantumCTek	SSE STAR Market	quantum cryptography	2020-07-09	trading
IBM	IBM	NYSE	superconducting	1911-11-11	trading
GOOGL	Alphabet (Google Quantum AI)	NASDAQ	superconducting	2004-08-19	trading
	Quantinuum	TBD	trapped-ion		ipo-filed

SECTION 02 // DIVERSIFIED QUANTUM EXPOSURE

Diversified Tech Companies with Quantum Programs

These companies have major quantum computing programs but derive nearly all revenue from other business lines. Quantum computing represents a small percentage of their total valuation.

Ticker	Company	Quantum Program	Approach	Key Hardware
IBM	IBM	IBM Quantum	Superconducting	Condor (1,121 qubits), Heron (156 qubits)
GOOG	Alphabet (Google)	Google Quantum AI	Superconducting	Willow (105 qubits)
MSFT	Microsoft	Azure Quantum	Topological	Majorana 1 (8 topological qubits)
AMZN	Amazon	AWS Braket / Amazon Quantum	Cat qubits (Ocelot)	Ocelot chip (research phase)
HON	Honeywell (via Quantinuum)	Quantinuum	Trapped-ion	H2 (56 qubits, 99.9975% fidelity)

DISCLAIMER

This page provides technical and market reference data about publicly traded quantum computing companies. It does not constitute financial advice, investment recommendations, or solicitation to buy or sell securities. Quantum computing stocks are speculative, volatile, and may result in significant losses. Always consult a qualified financial advisor before making investment decisions. Data sourced from SEC filings, company disclosures, and public exchange records.

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